[Answered ]-Django 1.7 migrations with abstract base classes

Your abstract base class should extend models.Model:

class CalendarDisplay(models.Model):
    ...

Your child class should then only extend CalendarDisplay– it doesn’t need to extend models.Model:

class Reservation(CalendarDisplay):
    ...

Also, you need to either not override __init__ in CalendarDisplay or you need to call super in your init:

def __init__(self, *args, **kwargs):
    super(CalendarDisplay, self).__init__(*args, **kwargs)